get-my-ip.py: Add a script for getting your public IP address

This will help students connect to each other on the LAN during class.
Note that if you ping a host across a NAT, you'll get your IP inside
the NAT, not the NAT's IP.
get-my-ip.py: Python 2.x sockets can't be used in 'with' statements

They don't have __exit__.  Use an explicit try/except block to be
compatible with both 2.x and 3.x.
make: Remove this whole section

We don't teach compiled languages, so the need to teach build systems
is not very strong.  I also use Make to help analyze my data, but
nobody has had the time or inclination to teach Make in a boot camp
yet (as far as I know).  Let's just remove this whole section.
Merge pull request #33 from wking/no-more-make

make: Remove this whole section
Instructor notes for teaching git via collaboration on GitHub.

The focus of the lesson is to have students contribute to a repo on GitHub in
which we are building up a list of the things they are most interested in
learning at the boot camp. Requires everyone have a good internet connection
and that at least some of the participants sign up for GitHub.
Merge pull request #37 from jiffyclub/git-github

Instructor notes for teaching git via collaboration on GitHub
Merge remote-tracking branch 'wking/get-my-ip'

Adds a small Python script for getting your IP address on the local network.